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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/934124/sn74lvc1g125-pull-up-down-resistor-for-sn74lvc1g125-sn74lvc1g126
PIN4的输出是否需要一个上拉电阻器？
2. PIN2是否有任何内部上拉或下拉电阻器？
只有当您希望在输出处于高阻抗状态时具有已定义的高电平电压时、输出才需要上拉电阻器。
如建议运行条件表的脚注(1)所示、输入没有上拉或下拉电阻、并且一定不能保持开路。
